The three Bone cousins — Fone Bone, Phoney Bone, and Smiley Bone — are separated and lost in a vast, uncharted desert. One by one, they find their way into a deep, forested valley filled with wonderful and terrifying creatures. Eventually, the cousins are reunited at a farmstead run by tough Gran’ma Ben and her spirited granddaughter. But little do the Bones know, there are dark forces conspiring against them, and their adventures are only just beginning!

Fone Bone and his cousins plan to return home after visiting the village of Barrelhaven with Thorn and Gran’ma Ben. But Phoney risks everything on one last get-rich-quick scheme for the town’s annual Great Cow Race. As usual, Phoney’s plans go disastrously awry, and Boneville seems further away than ever. Meanwhile, ominous signs indicate that a war is brewing, and Fone finds himself helping his friends defend their valley from a formidable enemy.

Lucius, Smiley, and Phoney survive an attack by the rat creatures and return safely to Lucius’ tavern inBarrelhaven. Phoney, desperate to win a bet with Lucius, stokes the townspeople’s fear of dragons andboasts that he is a professional dragonslayer. Back at the farm, Fone Bone and Thorn are troubled by strange dreams, and Gran’ma Ben’s reaction to them is stranger still: She reveals long-kept secrets and warns of great danger. Thorn, Fone Bone, and Gran’ma Ben may have to leave the farm forever.

When he is fooled by the townsfolk into thinking that he is a skilled dragonslayer, Phoney Bone takes on the challenge to find the Red Dragon while Thorn deals with haunted dreams and missing Gran'ma Ben.

While attempting to return a lost rat creature cub back to his home in the mountains, Fone and Smiley Bone's simple task turns into a major adventure after encountering the fierce mountain lion Rock Jaw.

The Bone cousins, Gran’ma Ben, and Thorn finally reach the city of Atheia, where they reunite with old friends and plan to thwart The Lord of the Locusts. The Pawan army has joined forces with Briar and the rat creatures, and danger increases as Thorn’s visions get stronger. Meanwhile, Phoney Bone is convinced Atheia is a city rich in gold, and he is determined to find it!

It's full-fledged war as Briar, the rat creatures, and the Pawan army storm the city of Atheia. The Bone cousins, Thorn, and Gran'ma Ben are all there to defend the Valley and stop the return of the Lord of the Locusts. When Thorn goes inside a ghost circle, she hears a voice urging her to seek the Crown of Horns. What follows is another dangerous journey for Thorn and loyal Fone Bone as they race to the sacred grounds of the dragons, searching for the one thing that may save them all. This is the breathtaking conclusion to Jeff Smith's nine-book graphic novel series.